Dynamo-electric machine.



. HOWELL.

DYNAMO ELECTRIC MACBINB. APPLICATION FILED 11110.30

Patented Aug. 29, 1911.

lnventor F I Ted B Howe Hlsqttoneg.,

companying drawin Figure 1 is a section of a dynamo-electric Vmachine provided with field coils.r embody- 'U'NITED sTATEs PATENT oEEieE.

FRED B. HOWELL, OF SCHENECTADY. NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION 0F NEW YORK.

DYNAMO-LECTRIC MACHINE.

To all whomV-i't may o'ncern:

Be 1t known tha I, FRED B. HOWELL, a

citizen `of the United States. residing at v My invention relates to dynamo-electric machines and 'ni ore particularly to field coils for such machines.

Heretofoi'e. in Ventilating field coils of dynamo-electric machines, ducts have been provided extending through the coil and through the spool surrounding the coil. My construction is an improvement over this andl is' particularly adapted for use in field coils of direct current dynamo-electric macbines7 which operate at a high potential and have; field windings that are, therefore, difficult to properly insulate.

It is' the object of my invention to proyide an efcient arrangement for Ventilating and insulating the field coils of such machines.'

Torthis end my invention consists of a field coilfor dynamo-electric machines com- ,prising a winding and Ventilating means therefor consisting of an .inclosed tube enibedded therein and provided with inlet and outlet openings.

Other features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming ay part of this specification.

For a better understanding of my invention, reference may be had to the following description taken in connection with the acg, in whiching my invention; Fig. 2 is a view of my field coil with parts broken away and in section; Fig. 3 is a section on thelline 3;--3 of Fig. Q. andFig. 4 is a section on` the line' 4"'4 of Fig. 2.

Referring to the drawing, the frame l'of the dynamo-electric'machine 'has fastened thereto poles 2, upon which are mounted field coils 3. The armature 4- is designed to` revolve within thepoles 2. Each field coil 3 comprises a spool 5, upon which is placed the 'winding of the eld coil. The inclosed tube' 7 is embedded in this winding and is provided with an inlet opening 8 on one Specification of Letters Patent.

Application filed December 30, 1909.

Patented Au". 29, 191i.,

Serial No. 535,669.

side of the winding and an outlet opening J on the other side of tbe winding. The tube T and the windingir of the field coil are separated from the spool 5 by suitableinsulation4 10. This tube may be forinedof steel and in two parts as shown in Fig. i2, one part ivliic'li has the inlet opening 8 in its side. being U-shaped and fitting into one side and two ends of the winding. and the other part,

which preferably has'tlie outlet opening 9 in the middle of its side fitting into the other side of the winding so as to complete a rentilating,` passage around the coil. The'winding of the eld coil is wound, a portion il about the inner -part of the spool and two portions 12 about the.upper part of the spool and the tube 7 and on botl-i sides of the openings 8 and 9.

I have shown in l a dynamo-electric machine having' four field coils in each of which is embedded a Ventilating tube. The inlet openings S of these tubes are connected in parallel to a source of cooling fluid7 such as air, which may be under pressure, by means of a system of piping 13. By connecting the tubes in parallel to the source of cooling fiuid, each field coil is cooled by fluid which has not previously been used for cooling, as wouldbe the case if the tubes were connected in series. Each inlet opening 8 is connected to the piping, system by means of a piece of pipe 14 made of insulating material, such as rubber, so that the tubes are insulated from the piping system and, therefore, from ground The outlet openings 9 of the tubes may be provided with parts l5 which direct the cooling' Huid against the armature et of the dynamo-electric machine after it has flowed through the tubes.

I desire it .to be understood that my invention is not limited to the particular construct-ion shown and described and l aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States, is,-

l. In a dynamo-electric machine, a field coil comprising a spool, a winding thereon, and Ventilating means therefor consisting of an inclosed tube, said winding comprising a plurality'of portions, one portion of said winding being wound about the inner of an in'closed tube having wound about said tube whereby the tube is embedded 1n the winding, said tube being Aprovided with inlet and outlet openings.

2. In a dynamo-electric machine, a field coil comprising a spool, a winding thereon, and .Ventilating means therefor consisting inlet and outlet openings, said winding consisting of a plu- -ality of portions, one of said portions being wound about-the inner part of the spool and the other portions being wound about said tube and on both sides of the openings therein whereby the tube is embedded in the winding.

3. In a dynamo-electric machine, a field coil comprising a spool, a winding thereon, Ventilating means therefor consisting of an inclosed tube having inlet and outlet openings, and insulation separating Said tube from said spool, said winding consisting of a plurality of portions, one of said portions being wound about the inner part of the spool and another of said portions being wound about said tube whereby the tube is embedded in the winding. 1

4. En a dynamo-electric machine, an armature, a helft coil comprising a windingand Ventilating means therefor consisting ot an inclosed tube embedded in said winding, said tube being provided with inlet and outlet openings, and means for supplying cooling' fluid to said inlet opening, said outlet opening directing the cooling` fluid flowing through said tube'against said armature.

5. In a dyna1no-electric machine, an ar mature, a field coil comprising a spool, a winding thereon,l Ventilating means therefor consisting of an inclosed tube having inlet and outlet openings, .said Winding consist ing of a plurality of portions, one of said portions being Wound about the inner part of said spool and Aanother of said portions being wound about said tube whereby thel tube is embedded in the winding, and ieaus for supplying cooling Huid to said inlet opening, said outlet opening directing' the coolingl l'luid flowing through said tube against said arma'ture. In wit-ness whereof, l have hereunto my hand this 29th day of December, 1909.

FRED B. HOWELL. lVitnesses BnNJAMiN B. HULL, HELEN Oarom). 

